Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems (1921)
Smith, Arthur Bessey, b. 1875, Campbell, Wilson Lee · New York : McGraw-Hill · leaf 437
o normal and extends the connection to an idle second selector, also inthe main office. When the calling partys dial is operated from fingerhole 3 this second selector extends the connection to a third selector in 412 A U TOM A TIC TELEPHON Y the 13,000 group of switches at Main. The next turning… … Or HILLTOPOFFICE (.Proposed) City Limits (Approximate) •A HANFORDOFFICE196 Lines I Fig. 310.—Skeleton diagram of automatic telephone system of one main central officesurrounded by sub-offices in Columbus, O. on the 500 board at the Hanford station. This connector switchresponds to the last two…
Telephone
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